What is the main role of teichoic acid in gram-positive bacteria?

Teichoic acid plays a crucial role in maintaining the structural integrity of the cell wall in gram-positive bacteria. It is embedded within the peptidoglycan layer, which is thick in these types of bacteria, and contributes to the rigidity and stability of the cell wall. This structural support is essential for withstanding various environmental stresses, such as changes in osmotic pressure and mechanical stress, which could otherwise lead to cell lysis.

In addition to providing structural support, teichoic acids also have roles in cell wall synthesis and regulation of cell division. They can play a part in controlling the interactions between the bacteria and their environment, facilitating adherence to surfaces, and potentially influencing the overall morphology of the bacterial cells.

The other options do not capture the primary role of teichoic acid accurately. While teichoic acids can have indirect roles related to immune evasion and may influence susceptibility to antibiotics, their dominant function pertains to structural integrity and support, making the choice focusing on structural support the most accurate in this context.